Professor Kimberly Prather and research groupUniversity of California, San Diego

Instrument MeasuresAerosol time-of-flight Individual particle size and compositionmass spectrometers (4)Scanning mobility particle size (20 nm to 0.6 um)particle sizing systems (2)Ultrafine aerosol mass spectrometer The composition of size selected particles

down to 50 nmAerodynamic particle sizing systems (3) Aerodynamic particle size (0.5 um to 10 um)Opticle particle counters (2) Opticle particle size (0.2 um to 10 um)Nephelometers Light backscattering (visibility)Flow tubes Used for measuring particle formation

processes and heterogeneous chemistry onshort time scales

Smog chamber system Used for measuring particle formation, growth,and chemistry of particles under controlledconditions of relative humidity and UV flux

Atmospheric Pressure Chemical Ionization Extremely sensitive technique for measuringMass Spectrometer gas phase species concentrationsMeteorological stations (3) Temperature, wind speed and direction,

relative humidityNOx system Gas phase concentrations of NOxOzone monitor Gas phase concentrations of ozoneSOx system Gas phase concentrations of SOxHPLC system Used for separation and detection of complex

mixturesGC system Used for separation and detection of complex

mixturesMOUDI impactors Size segregated particle mass concentrationsTapered element oscillating PM2.5 and PM10 mass concentrationmicrobalance (TEOM) Nd:YAG laser systems (nanosecond) (6) Used for LDI at 266 nm (also 1064, 532, and

355 nm available)CO2 laser system Used in 2-step LDI-TOFMS**Femtosecond IR laser (coming in Jan. 2002!!) Used for LDI in IR regionIn addition to the instruments above which are housed in our labs, we have access to a hostof other analytical instruments including electron microscopy (particle shape), UV-Vis,Raman, and IR spectrometers, AtomicForce Imaging instruments, surface analysis instruments, and a wide range of mass spectrometers.

PM = Particulate Matter

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• Nuclei mode• Accumulation mode• Coarse particle mode